How to convert string to integer type in php

In PHP, the integer type is a very important data type. When we need to perform numerical calculations, we often need to convert the value from the string type to the integer type. In PHP, multiple methods are provided to convert strings to integer types, and this article will introduce several of them.

Method 1: Use the intval function

intval is a function in PHP used to convert data types. The function of this function is to convert a string type value. For integer type. The method of using the function is as follows:

int intval ( mixed $var , int $base = 10 );

Among them, $var represents the variable that needs to be converted, $base represents the base of the current data, and the default is decimal.

For example, if we need to convert the string value "123" to an integer, we can use the following code:

$var = "123";
$int = intval($var);
echo $int;

The running result is:

123

Method 2: Use forced type conversion

Type conversion in PHP is mainly implemented through forced type conversion. For string conversion to integer, we can use the (int) or (integer) keyword to perform forced type conversion. . The code example is as follows:

$var = "456";
$int = (int)$var;
echo $int;

The running result is:

456

Method 3: Use the sscanf function

sscanf is a formatting character in PHP String functions can convert strings into variables of different types according to the specified format. Among them, %d means converting the string to an integer type. The function is used as follows:

int sscanf ( string $str , string $format [, mixed &$... ] );

For example, if we need to convert the string value "789" into an integer, we can use the following code:

$str = "789";
sscanf($str, "%d", $int);
echo $int;

The running result is:

789

Method 4: Use 0 operation

This method is a tricky way. We can convert the string into an integer type by adding the 0 operator after the string. conversion. The specific code is as follows:

$var = "1000";
$int = $var + 0;
echo $int;

The running result is:

1000

It should be noted that if the string contains non-numeric characters, this method will convert the non-numeric characters to 0 and continue the calculation. Therefore it is not reliable.

To sum up, there are many ways to convert string types to integer types in PHP. Choosing the appropriate method according to actual needs can improve writing efficiency and avoid errors.

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